Defining a static path through a communications network to provide wiretap law compliance

US20060018255A1Inactive Publication Date: 2006-01-26AVAYA INC
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  • Defining a static path through a communications network to provide wiretap law compliance
  • Defining a static path through a communications network to provide wiretap law compliance
  • Defining a static path through a communications network to provide wiretap law compliance

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Embodiment Construction

[0012] A major advantage of Voice over Internet Protocol (VoIP) is that it avoids the tolls charged by ordinary wired and wireless telephone service providers. Technical details of VoIP were developed by the VoIP Forum, an industry group comprised of participants from Cisco, VocalTel, 3Com, and Netspeak. The standard for VoIP is ITU-T H.323, which sets forth various protocols for sending voice, audio, and video across the public Internet or a private intranet using internet protocol (IP). Voice information is sent digitally in the form of discrete packets, as opposed to the traditional circuit-based protocols of the public switched telephone network (PSTN). Additionally, Session Internet Protocol (SIP) is an Internet Engineering Task Force (IETF) standard protocol for initiating an interactive user session that involves multimedia elements such as video, voice, chat, gaming, and virtual reality. SIP provides a mechanism for establishing, modifying, and terminating Internet telephony...

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Abstract

By defining a static path through a communications network for a call placed by an IP-based telephonic device, stream of packets representing the call are rendered available for wiretapping on a communications network that includes a first and a second switching / routing element. The static path is defined using Multiprotocol Label Switching (MPLS) and Resource Reservation Protocol (RSVP). The first switching / routing element responds to a call initiation request received from the telephonic device by sending an RSVP PATH message to the second switching / routing element. The first switching / routing element marks packets sent by the telephonic device with an identical MPLS Forwarding Equivalence Class (FEC) label, so that the plurality of packets will traverse a predesignated IP address in the communications path, and so as to allow law enforcement officials to monitor packets originating from an IP-based telephonic device using a monitoring mechanism situated at the predesignated IP address.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The invention relates generally to communication networks and, more specifically, to techniques for routing a packet-based voice call over a known path on a communication network. [0003] 2. Description of the Related Art [0004] By design, Internet Protocol (IP) allows data packets to travel from point A to point B over any available path. In a manner analogous to that of a motorist bypassing slow or stopped traffic, data packets are directed along a route so as to avoid congested network nodes. Although this traffic routing feature is desirable because it provides quick, efficient data packet transfers across the network, it poses a significant problem in situations where there is a need to monitor a stream of packets directed from point A to point B. Such a stream of packets may represent, for example, a telephone call using Voice over Internet Protocol (VoIP). Pursuant to the United States Federal Communications A...

Claims

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Application Information

Patent Timeline
26 Jan 2006
Publication
US20060018255A1
IPC
H04L12/56
CPC
H04L12/5695; H04L41/0803; H04L45/50; H04L47/15; H04M7/006; H04L47/801; H04L47/825; H04M3/2281
Inventors
TANKHIWALE, KAUSTUBHA A.